/*****************************************************************************
 * loadsave.c : Playlist loading / saving functions
 *****************************************************************************
 * Copyright (C) 1999-2004 VLC authors and VideoLAN
 * $Id$
 *
 * Authors: Samuel Hocevar <sam@zoy.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <vlc_common.h>
#include <vlc_playlist.h>
#include <vlc_events.h>
#include "playlist_internal.h"
#include "config/configuration.h"
#include <vlc_fs.h>
#include <vlc_url.h>
#include <vlc_modules.h>

int playlist_Export( playlist_t * p_playlist, const char *psz_filename,
                     playlist_item_t *p_export_root, const char *psz_type )
{
    if( p_export_root == NULL ) return VLC_EGENERIC;

    playlist_export_t *p_export =
        vlc_custom_create( p_playlist, sizeof( *p_export ), "playlist export" );
    if( unlikely(p_export == NULL) )
        return VLC_ENOMEM;

    msg_Dbg( p_export, "saving %s to file %s",
             p_export_root->p_input->psz_name, psz_filename );

    int ret = VLC_EGENERIC;

    /* Prepare the playlist_export_t structure */
    p_export->p_root = p_export_root;
    p_export->psz_filename = psz_filename;
    p_export->p_file = vlc_fopen( psz_filename, "wt" );
    if( p_export->p_file == NULL )
    {
        msg_Err( p_export, "could not create playlist file %s: %s",
                 psz_filename, vlc_strerror_c(errno) );
        goto out;
    }

    module_t *p_module;

    /* And call the module ! All work is done now */
    playlist_Lock( p_playlist );
    p_module = module_need( p_export, "playlist export", psz_type, true );
    playlist_Unlock( p_playlist );

    if( p_module != NULL )
    {
        module_unneed( p_export, p_module );
        if( !ferror( p_export->p_file ) )
            ret = VLC_SUCCESS;
        else
            msg_Err( p_playlist, "could not write playlist file: %s",
                     vlc_strerror_c(errno) );
    }
    else
        msg_Err( p_playlist, "could not export playlist" );
   fclose( p_export->p_file );
out:
   vlc_object_release( p_export );
   return ret;
}

int playlist_Import( playlist_t *p_playlist, const char *psz_file )
{
    input_item_t *p_input;
    const char *const psz_option = "meta-file";
    char *psz_uri = vlc_path2uri( psz_file, NULL );

    if( psz_uri == NULL )
        return VLC_EGENERIC;

    p_input = input_item_NewExt( psz_uri, psz_file,
                                 1, &psz_option, VLC_INPUT_OPTION_TRUSTED, -1 );
    free( psz_uri );

    playlist_AddInput( p_playlist, p_input, PLAYLIST_APPEND, PLAYLIST_END,
                       true, false );
    return input_Read( p_playlist, p_input );
}

/*****************************************************************************
 * A subitem has been added to the Media Library (Event Callback)
 *****************************************************************************/
static void input_item_subitem_tree_added( const vlc_event_t * p_event,
                                      void * user_data )
{
    playlist_t *p_playlist = user_data;
    input_item_node_t *p_root =
        p_event->u.input_item_subitem_tree_added.p_root;

    PL_LOCK;
    playlist_InsertInputItemTree ( p_playlist, p_playlist->p_media_library,
                                   p_root, 0, false );
    PL_UNLOCK;
}

int playlist_MLLoad( playlist_t *p_playlist )
{
    input_item_t *p_input;

    char *psz_datadir = config_GetUserDir( VLC_DATA_DIR );
    if( !psz_datadir ) /* XXX: This should never happen */
    {
        msg_Err( p_playlist, "no data directory, cannot load media library") ;
        return VLC_EGENERIC;
    }

    char *psz_file;
    if( asprintf( &psz_file, "%s" DIR_SEP "ml.xspf", psz_datadir ) == -1 )
        psz_file = NULL;
    free( psz_datadir );
    if( psz_file == NULL )
        return VLC_ENOMEM;

    /* lousy check for media library file */
    struct stat st;
    if( vlc_stat( psz_file, &st ) )
    {
        free( psz_file );
        return VLC_EGENERIC;
    }

    char *psz_uri = vlc_path2uri( psz_file, "file/xspf-open" );
    free( psz_file );
    if( psz_uri == NULL )
        return VLC_ENOMEM;

    const char *const options[1] = { "meta-file", };
    /* that option has to be cleaned in input_item_subitem_tree_added() */
    /* vlc_gc_decref() in the same function */
    p_input = input_item_NewExt( psz_uri, _("Media Library"),
                                 1, options, VLC_INPUT_OPTION_TRUSTED, -1 );
    free( psz_uri );
    if( p_input == NULL )
        return VLC_EGENERIC;

    PL_LOCK;
    if( p_playlist->p_media_library->p_input )
        vlc_gc_decref( p_playlist->p_media_library->p_input );

    p_playlist->p_media_library->p_input = p_input;

    vlc_event_attach( &p_input->event_manager, vlc_InputItemSubItemTreeAdded,
                        input_item_subitem_tree_added, p_playlist );
    PL_UNLOCK;

    input_Read( p_playlist, p_input );

    vlc_event_detach( &p_input->event_manager, vlc_InputItemSubItemTreeAdded,
                        input_item_subitem_tree_added, p_playlist );

    return VLC_SUCCESS;
}

int playlist_MLDump( playlist_t *p_playlist )
{
    char *psz_temp;

    psz_temp = config_GetUserDir( VLC_DATA_DIR );

    if( !psz_temp ) /* XXX: This should never happen */
    {
        msg_Err( p_playlist, "no data directory, cannot save media library") ;
        return VLC_EGENERIC;
    }

    char psz_dirname[ strlen( psz_temp ) + sizeof( DIR_SEP "ml.xspf")];
    strcpy( psz_dirname, psz_temp );
    free( psz_temp );
    if( config_CreateDir( (vlc_object_t *)p_playlist, psz_dirname ) )
    {
        return VLC_EGENERIC;
    }

    strcat( psz_dirname, DIR_SEP "ml.xspf" );

    if ( asprintf( &psz_temp, "%s.tmp%"PRIu32, psz_dirname, (uint32_t)getpid() ) < 1 )
        return VLC_EGENERIC;

    int i_ret = playlist_Export( p_playlist, psz_temp, p_playlist->p_media_library,
                     "export-xspf" );
    if ( i_ret != VLC_SUCCESS )
    {
        vlc_unlink( psz_temp );
        free( psz_temp );
        return i_ret;
    }

    i_ret = vlc_rename( psz_temp, psz_dirname );
    free( psz_temp );
    if( i_ret == -1 )
    {
        msg_Err( p_playlist, "could not rename %s.tmp: %s",
                 psz_dirname, vlc_strerror_c(errno) );
        return VLC_EGENERIC;
    }
    return VLC_SUCCESS;
}